diff --git a/lib/ProfileData/InstrProfReader.cpp b/lib/ProfileData/InstrProfReader.cpp
index 4f110a57122..12c3c8256be 100644
--- a/lib/ProfileData/InstrProfReader.cpp
+++ b/lib/ProfileData/InstrProfReader.cpp
@@ -101,6 +101,8 @@ error_code TextInstrProfReader::readNextRecord(InstrProfRecord &Record) {
     return error(instrprof_error::truncated);
   if ((Line++)->getAsInteger(10, NumCounters))
     return error(instrprof_error::malformed);
+  if (NumCounters == 0)
+    return error(instrprof_error::malformed);
 
   // Read each counter and fill our internal storage with the values.
   Counts.clear();
@@ -210,8 +212,10 @@ RawInstrProfReader<IntPtrT>::readNextRecord(InstrProfRecord &Record) {
 
   // Get the raw data.
   StringRef RawName(getName(Data->NamePtr), swap(Data->NameSize));
-  auto RawCounts = makeArrayRef(getCounter(Data->CounterPtr),
-                                swap(Data->NumCounters));
+  uint32_t NumCounters = swap(Data->NumCounters);
+  if (NumCounters == 0)
+    return error(instrprof_error::malformed);
+  auto RawCounts = makeArrayRef(getCounter(Data->CounterPtr), NumCounters);
 
   // Check bounds.
   auto *NamesStartAsCounter = reinterpret_cast<const uint64_t *>(NamesStart);
diff --git a/test/tools/llvm-profdata/Inputs/no-counts.profdata b/test/tools/llvm-profdata/Inputs/no-counts.profdata
new file mode 100644
index 00000000000..5c1fa15c086
--- /dev/null
+++ b/test/tools/llvm-profdata/Inputs/no-counts.profdata
@@ -0,0 +1,3 @@
+no_counts
+0
+0
diff --git a/test/tools/llvm-profdata/errors.test b/test/tools/llvm-profdata/errors.test
index 393e2d16856..28262efe063 100644
--- a/test/tools/llvm-profdata/errors.test
+++ b/test/tools/llvm-profdata/errors.test
@@ -11,3 +11,6 @@ INVALID-COUNT-LATER: error: {{.*}}invalid-count-later.profdata: Malformed profil
 RUN: not llvm-profdata show %p/Inputs/bad-hash.profdata 2>&1 | FileCheck %s --check-prefix=BAD-HASH
 RUN: not llvm-profdata merge %p/Inputs/bad-hash.profdata %p/Inputs/bad-hash.profdata -o %t.out 2>&1 | FileCheck %s --check-prefix=BAD-HASH
 BAD-HASH: error: {{.*}}bad-hash.profdata: Malformed profile data
+
+RUN: not llvm-profdata show %p/Inputs/no-counts.profdata 2>&1 | FileCheck %s --check-prefix=NO-COUNTS
+NO-COUNTS: error: {{.*}}no-counts.profdata: Malformed profile data
diff --git a/tools/llvm-profdata/llvm-profdata.cpp b/tools/llvm-profdata/llvm-profdata.cpp
index 0bd8e834f45..3e58bc205d0 100644
--- a/tools/llvm-profdata/llvm-profdata.cpp
+++ b/tools/llvm-profdata/llvm-profdata.cpp
@@ -111,6 +111,7 @@ int show_main(int argc, const char *argv[]) {
                  Func.Name.find(ShowFunction) != Func.Name.npos);
 
     ++TotalFunctions;
+    assert(Func.Counts.size() > 0 && "function missing entry counter");
     if (Func.Counts[0] > MaxFunctionCount)
       MaxFunctionCount = Func.Counts[0];